Al Haber removed as field secretary in March 1961, but he was quickly rehired after threatening to form another youth group. In May 1961 the YPSL tried to get the SDS to affiliate with a number of independent groups in which it was active, such as the Politics Club at the University of Chicago as chapters, but were rebuffed. The SDS gradually took a more radical line than its parent organization, the League for Industrial Democracy, which was controlled by the realignment caucus. It recruited among "red diaper babies" and criticized the "'paranoic' use of terms like 'stalinoid' and 'stalinist'. The dispute came to a head at the SDSs June 1962 convention at Port Huron, Michigan. The YPSL representative, Michael Harrington, objected to seating an observer from the Communist Party. Harrington was also upset with the manifesto adopted by the convention, the Port Huron Statement, for its criticism of American labor unions and for its criticism of liberal and socialist opposition to communism. He was able to get some concessions, but when he got back to New York he got a call from a yipsel saying that the changes had been thrown out. Harrington alerted the LID executive board who promptly changed the locks on the SDS doors, fired Al Haber (again) and summoned the SDS leaders for a stiff "talking to". After reading the statement, the LID board found that the changes Harrington had favored had been included in the final document; after some financial backers came to SDS's defense, the locks were removed from their office and Haber was reinstated. The incident left a negative impression on the SDS leaders toward democratic socialists and liberals. By 1964 the SP-SDF was becoming increasingly under the control of the realignment tendency, while the YPSL was becoming more radicalized, and tended more toward Trotskyism. At its national convention in August 1964 the YPSL elected a leadership particularly hostile to the party, passed resolutions moving the YPSL's headquarters to Chicago without consulting the party, deleted all references to the party in its constitution and initiated a referendum on seceding from the parent organization. The National Action Committee of the Socialist Party suspended the YPSL on September 8, pending a meeting of the full national committee. The national committee met on November 28–29 and passed two resolutions, one lifting the suspension if the YPSL would agree to continue in its constitutional role as